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That is a single barrel derringer. Manufacture is unknown. Originally, it was manufactured by Remington Arms Co. This exact model has been copied by American, Italian, and German manufacturers. Here in the US, Bryco / Jennings produced them. I will guess that this is a US made one. This particular gun was recovered from Mr. Keith Gladden of Baltimore, MD. He was arrested in connection with several murders. Mr. Gladden is an ex-con and was found with this gun and drugs.

This is either a FN P90 or PS90. The difference is the P90 is select fire short barrel and the PS90 is a semi-auto with a legal 16" barrel. This is one of the best bullpup design carbines and fires the FN 5.7X28mm cartridge. The detachable magazine holds 50 rounds. The overall length of the P90 (pictured) is just under 20". This carbine was used as the primary carbine in the TV series Stargate SG-1.

Main benefits is the size, weight, sex appeal, and capacity. Really, it's the sex appeal and capacity. FN also made a pistol that uses the same cartridge and it holds 20 rounds and it's light, but it's not so sexy. The grip is too big. But was it effective??? Not really. The bullet was the problem.

The FN 5.7x28 pretty much mirrors the ballistics of the .22 WMR (.22 magnum). Both calibers get great velocity and penetration when shot through a rifle length barrel. Main difference between the calibers is that FN 5.7x28 IS available in a Armor Piercing round (AP).